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heart
Title: heart
Category: Science & Technology
Details: Words: 1995 | Pages: 8.5 (approximately 235 words/page)
heart
HEART
The human heart is a specialized, four-chambered muscle that maintains BLOOD flow in the CIRCULATORY
SYSTEM. Located in the thorax, it lies left of the body's midline, above and in contact with the
diaphragm. It is situated immediately behind the breastbone, or sternum, and between the lungs, with its
apex tilted to the body cavity's left side. In most people the apex can be felt during each heart
contraction. At rest, the heart pumps …showed first 75 words of 1995 total…
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…showed last 75 words of 1995 total…chest wall.
The electrocardiogram (cardiogram, ECG) that is obtained in this way furnishes information about the
rhythm of the heart, the conduction of the stimulus, and the condition of the heart muscle. Other methods
that have been devised to examine the heart are the mechanical recording of the heartbeat,
echocendiography and radioisotopes, X-ray analysis of the heart's form and movements, and X-ray contrast
studies of the blood flow through the heart and the coronary vessels.
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